The impact of selected CNC machining parameters on the surface roughness of the 7075 aluminium alloy

Abstract

Modern machining operations are characterized by very high precision and high quality of the surface. In order to achieve such surface quality, many factors influencing the tested parameters should be taken consideration. The most important parameter that allows estimating surface quality after machining is the roughness parameter, and more precisely arithmetical mean deviation of the assessed profile - Ra. The paper titled “The impact of selected CNC machining parameters on the surface roughness of the 7075 aluminum alloy” describes the test process, which aims to set parameters of machining that allow obtaining the highest quality of the surface of the processed material. During the research, a number of tests were carried out. The tests were carried out with various machining parameters. During the research cycle, two main parameters were taken into consideration that have an impact on the quality of the surface. The research process assumed a change of the speed and feed parameters. Afterward, a dependence between them and surface quality was assessed. Other parameters such as the cutting direction, the number of tool blades and the depth of cut remained unchanged. All tests were carried out on samples made of 7075 aluminum alloy (PA9, AlAnMgCu1,5). The samples were made using the MAZAK VTC-530C CNC machine. A portable surface roughness measuring device MarSurf PS10 was used for data acquisition. Further testing will also include other parameters. Such an approach will allow gathering a full set of information about proper processing of that particular material. Designed testing process will be also possible to apply to any other material.